Conjugaison du verbe anglais COULD PERFORM

I could perform
you could perform
he could perform
we could perform
you could perform
they could perform

I could be performing
you could be performing
he could be performing
we could be performing
you could be performing
they could be performing

I could have performed
you could have performed
he could have performed
we could have performed
you could have performed
they could have performed

I could have been performing
you could have been performing
he could have been performing
we could have been performing
you could have been performing
they could have been performing

I could not perform
you could not perform
he could not perform
we could not perform
you could not perform
they could not perform

I could not be performing
you could not be performing
he could not be performing
we could not be performing
you could not be performing
they could not be performing

I could not have performed
you could not have performed
he could not have performed
we could not have performed
you could not have performed
they could not have performed

I could not have been performing
you could not have been performing
he could not have been performing
we could not have been performing
you could not have been performing
they could not have been performing

could I perform?
could you perform?
could he perform?
could we perform?
could you perform?
could they perform?

could I be performing?
could you be performing?
could he be performing?
could we be performing?
could you be performing?
could they be performing?

could I have performed?
could you have performed?
could he have performed?
could we have performed?
could you have performed?
could they have performed?

could I have been performing?
could you have been performing?
could he have been performing?
could we have been performing?
could you have been performing?
could they have been performing?

could I not perform?
could you not perform?
could he not perform?
could we not perform?
could you not perform?
could they not perform?

could I not be performing?
could you not be performing?
could he not be performing?
could we not be performing?
could you not be performing?
could they not be performing?

could I not have performed?
could you not have performed?
could he not have performed?
could we not have performed?
could you not have performed?
could they not have performed?

could I not have been performing?
could you not have been performing?
could he not have been performing?
could we not have been performing?
could you not have been performing?
could they not have been performing?